scholarly journals Antibacterial and Mode of Action of Extracts from Endophytic Fungi Derived from Terminalia mantaly, Terminalia catappa, and Cananga odorata

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Michele Ines Kanko Mbekou ◽  
Darline Dize ◽  
Victorine Lorette Yimgang ◽  
Fred Djague ◽  
Rufin Marie Kouipou Toghueo ◽  
...  
Keyword(s):  
Endophytic Fungi ◽  
Biological Activities ◽  
Radical Scavenging ◽  
Resistant Bacteria ◽  
Bacterial Strains ◽  
Terminalia Catappa ◽  
Wide Range ◽  
Broth Microdilution Method ◽  
Aspergillus Sp ◽  
Cananga Odorata

Emerging drug-resistant bacteria creates an urgent need to search for antibiotics drugs with novel mechanisms of action. Endophytes have established a reputation as a source of structurally novel secondary metabolites with a wide range of biological activities. In the present study, we explore the antibacterial potential of endophytic fungi isolated from different tissues of Terminalia mantaly, Terminalia catappa, and Cananga odorata. The crude ethyl acetate extracts of 56 different endophytic fungi were screened against seven bacterial strains using the broth microdilution method. The antibacterial modes of action of the most active extracts (04) were evaluated using E. coli ATCC 25922 and H. influenzae ATCC 49247 strains. Both the DPPH and FRAP assays were used to investigate their antioxidant activity, and their cytotoxicity against the Vero cell line was evaluated using the MTT assay. Out of the 56 crude extracts tested, about 13% were considered very active, 66% partially active, and 21% nonactive against all tested bacterial strains with MIC values ranging from 0.32 μg/mL to 25 μg/mL. The four more potent extracts (MIC <5 μg/mL) (from Aspergillus sp. N454, Aspergillus sp. N13, Curvularia sp. N101, and Aspergillus sp. N18) significantly lysed the bacteria cells, increased outer membrane permeability, reduced salt tolerance, and inhibited bacterial catalase activity. They exhibited a DPPH free radical scavenging activity with I C 50 ranging from 150.71 to 936.08 μg/mL. Three of the four potent extracts were noncytotoxic against the Vero cells line ( C C 50 > 100  μg/mL). Results from this investigation demonstrated that endophytes from Cameroonian medicinal plants might content potent antibacterial metabolites. The bioguided fractionation of these potent extracts is ongoing to isolate and characterise potential active ingredients.

scholarly journals Beehive Products as Antibacterial Agents: A Review

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 717
Author(s):  
Rita Abou Nader ◽  
Rawan Mackieh ◽  
Rim Wehbe ◽  
Dany El El Obeid ◽  
Jean Marc Sabatier ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Honey Bee ◽  
Antibacterial Agents ◽  
Royal Jelly ◽  
Biological Activities ◽  
Vital Role ◽  
Bee Venom ◽  
Bacterial Strains ◽  
Wide Range ◽  
Life Threatening

Honeybees are one of the most marvelous and economically beneficial insects. As pollinators, they play a vital role in every aspect of the ecosystem. Beehive products have been used for thousands of years in many cultures for the treatment of various diseases. Their healing properties have been documented in many religious texts like the Noble Quran and the Holy Bible. Honey, bee venom, propolis, pollen and royal jelly all demonstrated a richness in their bioactive compounds which make them effective against a variety of bacterial strains. Furthermore, many studies showed that honey and bee venom work as powerful antibacterial agents against a wide range of bacteria including life-threatening bacteria. Several reports documented the biological activities of honeybee products but none of them emphasized on the antibacterial activity of all beehive products. Therefore, this review aims to highlight the antibacterial activity of honey, bee venom, propolis, pollen and royal jelly, that are produced by honeybees.

scholarly journals Antimicrobial and antioxidant potentials of non-cytotoxic extracts of corticolous lichens sampled in Armenia

AMB Express ◽  
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Razmik Sargsyan ◽  
Arsen Gasparyan ◽  
Gohar Tadevosyan ◽  
Hovik Panosyan
Keyword(s):  
Antifungal Activity ◽  
Methanol Extract ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Cytotoxic Activities ◽  
Bacterial Strains ◽  
Evernia Prunastri ◽  
Wide Range ◽  
Antibacterial And Antifungal ◽  
Acetone Extracts

AbstractDue to wide range of secondary metabolites, lichens were used from antiquity as sources of colorants, perfumes and medicaments. This research focuses on exploring the antioxidant, antimicrobial and cytotoxic activities of methanol, ethanol, acetone extracts and aqueous infusions of corticolous lichens sampled from Armenia. Methanol, ethanol and acetone extracts from all tested lichens were active against Gram-positive bacterial strains. The most effective solvent to retrieve antimicrobial compounds was methanol. Aqueous infusions of tested lichens didn’t show any significant antibacterial and antifungal activity. The highest antimicrobial activity was observed for methanol extract of Ramalina sinensis. The minimum inhibitory concentration of methanol extract of Ramalina sinensis were 0.9–1.8 mg mL− 1. Pseudevernia furfuracea demonstrated antifungal activity (Ø 12 mm). Methanol extract of Parmelia sulcata demonstrated largest 1,1-diphenyl-2-picryl-hydrazil (DPPH) radical scavenging activity (71 %). The cytotoxicity was measured on human HeLa (cervical carcinoma) cell lines using microculture tetrazolium test assay. The IC50 values estimated for methanol extracts of Peltigera praetextata, Evernia prunastri, Ramalina sinensis and Ramalina farinacea species in HeLa cell line were within 1.8–2.8 mg mL− 1 and considered as non-cytotoxic. Obtained results suggest that studied lichens can be prospective in biotechnologies as alternative sources of antimicrobial and antioxidant substances.

scholarly journals Synthesis, Antiproliferative Activity and Radical Scavenging Ability of 5-O-Acyl Derivatives of Quercetin

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1608
Author(s):  
Stephen Lo ◽  
Euphemia Leung ◽  
Bruno Fedrizzi ◽  
David Barker
Keyword(s):  
Antiproliferative Activity ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Breast Cancer Cell Lines ◽  
Scavenging Activity ◽  
Plant Materials ◽  
Wide Range ◽  
Derivatives Of ◽  
Acyl Derivatives

Quercetin is a flavonoid that is found in many plant materials, including commonly eaten fruits and vegetables. The compound is well known for its wide range of biological activities. In this study, 5-O-acyl derivatives of quercetin were synthesised and assessed for their antiproliferative activity against the HCT116 colon cancer and MDA-MB-231 breast cancer cell lines; and their radical scavenging activity against the 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical cation and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical species. Four derivatives were found to have improved the antiproliferative activity compared to quercetin whilst retaining radical scavenging activity.

scholarly journals Bioactive Compounds of Selected Fruit Juices

2009 ◽  
Vol 4 (5) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Aneta Wojdyłto ◽  
Jan Oszmiański
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Fruit Juice ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Sea Buckthorn ◽  
Quercetin Derivatives ◽  
Reducing Ability ◽  
Wide Range

Fruits are one of the most important sources of phenolic compounds in our diet. Many of these compounds exhibit a wide range of biological activities, especially antioxidant activity. The objective of this study was to determine the composition and antioxidant activity of phenolic compounds found in fruit juice obtained from buckthorn, flowering quince, rowanberry and hawthorn. Hydroxycinnamic acids (neochlorogenic and chlorogenic acid) and procyanidins were the main phenolics in rowanberry juice. The highest level of flavonols (quercetin derivatives) was found in sea buckthorn. All juices showed strong free-radical scavenging activity against ABTS•+ radicals and ferric reducing ability measured by the FRAP method. The strongest antioxidant activity was found in rowanberry juice, but the lowest was measured in hawthorn and sea buckthorn juices.

scholarly journals Diversity and Biological Activities of Endophytic Fungi at Al-Qassim Region

2019 ◽  
Vol 9 (1) ◽  
pp. 160
Author(s):  
Nahla Tharwat Elazab
Keyword(s):  
Endophytic Fungi ◽  
Extracellular Enzymes ◽  
Biological Activities ◽  
Trichoderma Viride ◽  
Pathogenic Fungi ◽  
Phytopathogenic Fungi ◽  
Antagonistic Effect ◽  
Wild Plants ◽  
Dual Culture ◽  
Wide Range

In recent year&rsquo;s endophytic fungi has become a major concern on their host plants by enhancing their growth, increasing their fitness, strengthening their tolerances to abiotic and biotic stresses, and promoting their accumulation of secondary metabolites. Kingdom of Saudi Arabia has a wide range of flora which may be a rich source of endophytic fungi so that, the present study involves diversity and bioactivity of the endophytic fungal community in Al-Qassim region from 15 wild plants 162 isolates were obtained and identified. Among them, the most common isolates were Aspergillus niger, Aspergillus terreus, Aspergillus ochraceous and Trichoderma viride, these four endophytic isolates were examined for its antagonistic effect against six phytopathogenic fungi using two different assays, Dual-culture and Culture filtrate. Trichoderma viride recorded the most significant growth inhibition of almost pathogenic fungi followed by the three endophytic Aspergillus spp. In addition, these four endophytic fungi were screened for the production of some extracellular enzymes such as protease, cellulose, amylase, pectinase and xylanase. Our results show the ability of these isolates to produce these extracellular enzymes so this indicated the possible role of endophytic fungi as a biocontrol agent of plant disease.

scholarly journals Antioxidant Effect of Moroccan Pomegranate (Punica granatum L. Sefri Variety) Extracts Rich in Punicalagin against the Oxidative Stress Process

Foods ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 2219
Author(s):  
Lamiae Benchagra ◽  
Hicham Berrougui ◽  
Mohamed Obaidul Islam ◽  
Mhamed Ramchoun ◽  
Samira Boulbaroud ◽  
...  
Keyword(s):  
Biological Activities ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Natural Antioxidants ◽  
Punica Granatum ◽  
Food Preservation ◽  
Anthocyanin Content ◽  
Wide Range ◽  
Phenolic Extract ◽  
Punica Granatum L

Natural antioxidants products are widely distributed in food and medicinal plants. These natural antioxidants, especially polyphenols, exhibit a wide range of biological activities including anti-cancer, anti-inflammatory, and anti-atherosclerosis activities. Pomegranate (Punica granatum L.) is a rich source of polyphenolic components. The purpose of this study was to characterize the phenolic composition and flavonoids and anthocyanin content of different parts (peel and aril) of the Sefri variety of pomegranate. Our results showed that Peel extract was richer in these compounds than that of the Arils, especially in Punicalagin (A and B). DPPH free radical scavenging, reducing power (FRAP), β-carotene bleaching, and hydrogen peroxide scavenging assays revealed a greater dose-dependent activity of pomegranate peel phenolic extract (PPPE) compared to pomegranate aril phenolic extract (PAPE). PPPE was also more potent than PAPE concerning its ability to inhibit conjugated diene formation and to reduce α-tocopherol disappearance induced by CuSO4-mediated LDL peroxidation. Interestingly, both extracts (PPPE and PAPE) significantly inhibited lipid peroxidation and the formation of reactive oxygen species (ROS) in stressed J82 human bladder cancer cells. These results reflect the protective effects that this Moroccan variety of pomegranate can provide against the development of metabolic disorder, cancer, atherosclerosis, and cardiovascular disease. Given these properties, further studies should be undertaken to investigate possible applications of Sefri pomegranate extracts in the fields of food preservation and health supplements.

scholarly journals Isolation of phytoconstituents and evaluation of biological potentials of Berberis hispanica from Algeria

2018 ◽  
Vol 13 (2) ◽  
pp. 179 ◽  
Author(s):  
Redouane Lemoui ◽  
Samira Benyahia ◽  
Labib Noman ◽  
Ilham Bencherchar ◽  
Feyza Oke-Altuntas ◽  
...  
Keyword(s):  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Video Clip ◽  
Radical Scavenging ◽  
2D Nmr ◽  
Butylated Hydroxytoluene ◽  
Klebsiella Pneumonia ◽  
Bacterial Strains ◽  
Remarkable Effect ◽  
Berberis Hispanica

<p class="Abstract">The aim of this study was to isolate the phytoconstituents and evaluate the biological activities of <em>Berberis hispanica</em>. Three phenolic compounds (tamarixetin, caffeic acid and rutin)  were isolated from <em>B. hispanica</em>. The structures of the pure compounds were elucidated by spectroscopic and mass-spectrometric analyses, including 1D-, 2D-NMR, and HPLC-TOF/MS. In addition, antimicrobial, anti-oxidant and anti-proliferative effects of the extracts, some fractions and isolated compounds were evaluated. The extracts of B. hispanica were evaluated against six bacterial strains and exhibited the highest activity against <em>Klebsiella pneumonia</em> (15 mm at 100 mg/mL). Fraction T36 (IC<sub>50</sub>&lt;5 μg/mL) from the n-butanol extract displayed higher radical scavenging activity than butylated hydroxytoluene. The isolated compounds were evaluated for their antiproliferative effects against human cervical adenocarcinoma (HeLa) cell line by real time cell analyzer assay and tamarixetin exhibited the remarkable effect (IC<sub>50</sub>&lt;50 μg/mL) on HeLa cells. This study supports the documented medicinal effects of <em>B. hispanica</em>.</p><p class="Abstract"><strong>Video Clip of Methodology</strong>:</p><p class="Abstract">Antiproliferative Assay: 4 min 31 sec   <a href="https://www.youtube.com/v/vi_fS47fpY0&amp;t=3s">Full Screen</a>   <a href="https://www.youtube.com/watch?v=vi_fS47fpY0&amp;t=3s">Alternate</a></p>

3,4-Dihydroisocoumarins, Interesting Natural Products: Isolation, Organic Syntheses and Biological Activities

2019 ◽  
Vol 16 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Aurelio Ortiz ◽  
Miriam Castro ◽  
Estibaliz Sansinenea
Keyword(s):  
Natural Products ◽  
Biological Activities ◽  
Natural Compounds ◽  
Biologically Active ◽  
Bacterial Strains ◽  
Drug Candidates ◽  
Heterocyclic Molecules ◽  
Naturally Occurring ◽  
Wide Range ◽  
Different Sources

Background:3,4-dihydroisocoumarins are an important small group belonging to the class of naturally occurring lactones isolated from different bacterial strains, molds, lichens, and plants. The structures of these natural compounds show various types of substitution in their basic skeleton and this variability influences deeply their biological activities. These lactones are structural subunits of several natural products and serve as useful intermediates in the synthesis of different heterocyclic molecules, which exhibit a wide range of biological activities, such as anti-inflammatory, antiplasmodial, antifungal, antimicrobial, antiangiogenic and antitumoral activities, among others. Their syntheses have attracted attention of many researchers reporting many synthetic strategies to achieve 3,4-dihydroisocoumarins and other related structures. </P><P> Objective: In this context, the isolation of these natural compounds from different sources, their syntheses and biological activities are reviewed, adding the most recent advances and related developments.Conclusion:This review aims to encourage further work on the isolation and synthesis of this class of natural products. It would be beneficial for synthetic as well as the medicinal chemists to design selective, optimized dihydroisocoumarin derivatives as potential drug candidates, since dihydroisocoumarin scaffolds have significant utility in the development of therapeutically relevant and biologically active compounds.

Synthesis, Antioxidant and Antitumor Activity of Some Substituted 9-Anilinoacridine and 4-Anilinoquinolines Derivatives

2018 ◽  
Vol 15 (6) ◽  
pp. 846-852 ◽  
Author(s):  
Fatimah A. Agili
Keyword(s):  
Antioxidant Activity ◽  
Antitumor Activity ◽  
Biological Activities ◽  
Radical Scavenging ◽  
Breast Adenocarcinoma ◽  
Liver Carcinoma ◽  
Quinoline Derivatives ◽  
Wide Range ◽  
Anti Cancer ◽  
Radical Scavenging Ability

Background: Acridine and quinoline derivatives have a wide range of biological activities such as antioxidant and antitumor where quinoline derivatives intercalate between base pairs of double-stranded DNA through π-π interactions. Therefore, the development of new compounds with antitumor activity could be an important therapeutic strategy against this metabolic syndrome. Objective: This study was undertaken to synthesize different series of new anilinoacridines and anlinoquinoline with different substituents having biological activity. Materials and Methods: A series of new anilinoacridines and anlinoquinoline with different substituents was prepared by condensation of methyl 3-amino-4-methoxybenzoate hydrochloride with 9- chloroacridine and 4- chloroquinoline to give the target derivatives. Results: New anilinoacridines and anlinoquinoline with different substituents have been synthesized as antioxidant and anti-cancer agents. The structure of the synthesized compounds was confirmed by using spectral methods (FT-IR, 1H-NMR). The antioxidant activity of the synthesized compounds was evaluated by using DPPH radical scavenging ability. Also, the anti-cancer activity was evaluated using lung carcinoma, breast adenocarcinoma and liver carcinoma. The developed compounds 4a, b, 5a,b, 7a,b and 8a,b have shown a potent antioxidant activity. On the other hand, 4a, b, 5a and 7a exhibited the best antitumor activity against both A-549 and MCF7 cancer cells. Conclusion: For the active developed compounds, the most active antioxidant and antitumor one was 4a which registered the highest radical scavenging as well as antitumor activity.

Antibacterial and antioxidant activities of endophytic fungi and nettle (Urtica dioica L.) leaves as their host

2021 ◽  
Vol 67 (3) ◽  
pp. 204-211
Author(s):  
Djouza Salmi ◽  
Catherine Riou ◽  
Mohammad Issawi ◽  
Yacine Titouche ◽  
Veronica Ambrosini ◽  
...  
Keyword(s):  
Endophytic Fungi ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Antimicrobial Activities ◽  
Urtica Dioica ◽  
Biologically Active ◽  
Bioactive Metabolites ◽  
Wide Range ◽  
Thiol Content ◽  
Pharmaceutical Industries

Nettle (Urtica dioica L), as a plant rich in biologically active compounds, is one of the most important plants used in herbal medicine. Studies have shown that this plant has antioxidant, antiplatelet, hypoglycemic and hypocholesterolemia effects. In this study, we characterized three Alternaria endophytic fungi isolated from their host U. dioica. We hypothesized that these endophytic fungi can produce new bioactive metabolites, which may possess the bioactive property with potential application in the medical and pharmaceutical industries. The antibacterial activity was evaluated against reference and isolated strains, including Methicillin-Resistant Staphylococcus aureus. A wide range of antimicrobial activities similar to those measured in nettle leaves was detected especially for Alternaria sorghi. Furthermore, the highest antioxidant activity detected with DPPH free radical scavenging was measured for A. sorghi and nettle leaves ethyl acetate extracts. In addition, whereas catalase activity was similar in the three isolated fungi and nettle leaves, total thiol content and superoxide dismutase activity were significantly higher in leaves. A. sorghi showed the best activities compared to other isolated fungi. The characterization and further production of bioactive compounds produced by this endophyte should be investigated to fight bacteria and especially those that develop drug multi-resistance.

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